fixes iter0 in rare condition

TurTLE/DNS_statistics.py

@@ -74,7 +74,7 @@ def compute_statistics(
         with self.get_data_file() as data_file:
             if 'moments' not in data_file['statistics'].keys():
                 return None
-            iter0 = min((data_file['statistics/moments/velocity'].shape[0] *
+            iter0 = min(((data_file['statistics/moments/velocity'].shape[0]-1) *
                          self.parameters['niter_stat']),
                         iter0)
             if type(iter1) == type(None):